Ellen Oshains, a scenic artist for the Metropolitan Opera, applied black paint to the stage before opening night.

The final scene of the Metropolitan Opera’s new “Das Rheingold” failed to function as planned during the premiere Monday in New York.

The Met confirms that the final set move didn’t happen — which left the actors looking at an abstract rainbow instead of walking off toward Valhalla. Designed by director Robert Lepage, the set consists of 24 planks that move together to suggest a variety of shapes and forms during the three-hour (and no intermission) performance.